package com.hunlian.makelove.tuyaimage;

/**
 * Created by 201503245252 on 2016/3/2.
 */

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.MotionEvent;
import android.view.View;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 *
 * @category: View实现涂鸦、撤销以及重做功能
 * @author: 锋翼
 * @link: www.apkstory.com
 * @date: 2012.1.4
 *
 */
public class TuyaView extends View {
    private Bitmap mBitmap;
    private Canvas mCanvas;
    private Path mPath;
    private Paint mBitmapPaint;// 画布的画笔
    private Paint mPaint;// 真实的画笔
    private float mX, mY;// 临时点坐标
    private static final float TOUCH_TOLERANCE = 4;
    // 保存Path路径的集合,用List集合来模拟栈
    private static List<DrawPath> savePath;
    // 记录Path路径的对象
    private DrawPath dp;
    private int screenWidth, screenHeight;// 屏幕長寬
    private class DrawPath {
        public Path path;// 路径
        public Paint paint;// 画笔
    }




    public TuyaView(Context context, int w, int h) {
        super(context);
        screenWidth = w;
        screenHeight = h;
        //mBitmap= BitmapFactory.decodeResource(getResources(), R.mipmap.splish_content_two).copy(Bitmap.Config.ARGB_8888, true);
        mBitmap = Bitmap.createBitmap(screenWidth, screenHeight,
                Bitmap.Config.ARGB_4444);
        // 保存一次一次绘制出来的图形
        mCanvas = new Canvas(mBitmap);
        mBitmapPaint = new Paint(Paint.DITHER_FLAG);
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);// 设置外边缘
        mPaint.setStrokeCap(Paint.Cap.SQUARE);// 形状
        mPaint.setStrokeWidth(20);// 画笔宽度
        savePath = new ArrayList<DrawPath>();
    }
    @Override
    public void onDraw(Canvas canvas) {

        //canvas.drawColor(0xFFAAAAAA);
        // 将前面已经画过得显示出来
        canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
        if (mPath != null) {
            // 实时的显示
            canvas.drawPath(mPath, mPaint);
        }
    }

    /**
     *设置画笔宽度
     *@author zealjiang
     *@time 2016/6/3 18:11
     */
    public void setPaintSize(int size){
        mPaint.setStrokeWidth(size);// 画笔宽度
    }

    private void touch_start(float x, float y) {
        mPath.moveTo(x, y);
        mX = x;
        mY = y;
    }
    private void touch_move(float x, float y) {
        float dx = Math.abs(x - mX);
        float dy = Math.abs(mY - y);
        if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
            // 从x1,y1到x2,y2画一条贝塞尔曲线，更平滑(直接用mPath.lineTo也是可以的)
            mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
            mX = x;
            mY = y;
        }
    }
    private void touch_up() {
        mPath.lineTo(mX, mY);
        mCanvas.drawPath(mPath, mPaint);
        //将一条完整的路径保存下来(相当于入栈操作)
        savePath.add(dp);
        mPath = null;// 重新置空
    }
    /**
     * 撤销的核心思想就是将画布清空，
     * 将保存下来的Path路径最后一个移除掉，
     * 重新将路径画在画布上面。
     */
    public void undo() {
        mBitmap = Bitmap.createBitmap(screenWidth, screenHeight,
                Bitmap.Config.ARGB_4444);
        mCanvas.setBitmap(mBitmap);// 重新设置画布，相当于清空画布
        // 清空画布，但是如果图片有背景的话，则使用上面的重新初始化的方法，用该方法会将背景清空掉...
        if (savePath != null && savePath.size() > 0) {
            // 移除最后一个path,相当于出栈操作
            savePath.remove(savePath.size() - 1);
            Iterator<DrawPath> iter = savePath.iterator();
            while (iter.hasNext()) {
                DrawPath drawPath = iter.next();
                mCanvas.drawPath(drawPath.path, drawPath.paint);
            }
            invalidate();// 刷新

            /*在这里保存图片纯粹是为了方便,保存图片进行验证*/
/*            String fileUrl = Environment.getExternalStorageDirectory()
                    .toString() + "/android/data/test.png";
            try {
                FileOutputStream fos = new FileOutputStream(new File(fileUrl));
                mBitmap.compress(CompressFormat.PNG, 40, fos);
                fos.flush();
                fos.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }*/
        }
    }
    /**
     * 重做的核心思想就是将撤销的路径保存到另外一个集合里面(栈)，
     * 然后从redo的集合里面取出最顶端对象，
     * 画在画布上面即可。
     */
    public void redo(){
        //如果撤销你懂了的话，那就试试重做吧。
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float x = event.getX();
        float y = event.getY();
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                // 每次down下去重新new一个Path
                mPath = new Path();
                //每一次记录的路径对象是不一样的
                dp = new DrawPath();
                dp.path = mPath;
                dp.paint = mPaint;
                touch_start(x, y);
                invalidate();
                break;
            case MotionEvent.ACTION_MOVE:
                touch_move(x, y);
                invalidate();
                break;
            case MotionEvent.ACTION_UP:
                touch_up();
                invalidate();
                break;
        }
        return true;
    }
}
